microblaze_mmu_v2: Makefiles
[linux-2.6.git] / arch / microblaze / kernel / irq.c
1 /*
2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3  * Copyright (C) 2007-2009 PetaLogix
4  * Copyright (C) 2006 Atmark Techno, Inc.
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file "COPYING" in the main directory of this archive
8  * for more details.
9  */
10
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/hardirq.h>
14 #include <linux/interrupt.h>
15 #include <linux/irqflags.h>
16 #include <linux/seq_file.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/irq.h>
19
20 #include <asm/prom.h>
21
22 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
23 {
24         struct of_irq oirq;
25
26         if (of_irq_map_one(dev, index, &oirq))
27                 return NO_IRQ;
28
29         return oirq.specifier[0];
30 }
31 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
32
33 /*
34  * 'what should we do if we get a hw irq event on an illegal vector'.
35  * each architecture has to answer this themselves.
36  */
37 void ack_bad_irq(unsigned int irq)
38 {
39         printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
40 }
41
42 static u32 concurrent_irq;
43
44 void do_IRQ(struct pt_regs *regs)
45 {
46         unsigned int irq;
47         struct pt_regs *old_regs = set_irq_regs(regs);
48
49         irq_enter();
50         irq = get_irq(regs);
51 next_irq:
52         BUG_ON(irq == -1U);
53         generic_handle_irq(irq);
54
55         irq = get_irq(regs);
56         if (irq != -1U) {
57                 pr_debug("next irq: %d\n", irq);
58                 ++concurrent_irq;
59                 goto next_irq;
60         }
61
62         irq_exit();
63         set_irq_regs(old_regs);
64 }
65
66 int show_interrupts(struct seq_file *p, void *v)
67 {
68         int i = *(loff_t *) v, j;
69         struct irqaction *action;
70         unsigned long flags;
71
72         if (i == 0) {
73                 seq_printf(p, "         ");
74                 for_each_online_cpu(j)
75                         seq_printf(p, "CPU%-8d", j);
76                 seq_putc(p, '\n');
77         }
78
79         if (i < nr_irq) {
80                 spin_lock_irqsave(&irq_desc[i].lock, flags);
81                 action = irq_desc[i].action;
82                 if (!action)
83                         goto skip;
84                 seq_printf(p, "%3d: ", i);
85 #ifndef CONFIG_SMP
86                 seq_printf(p, "%10u ", kstat_irqs(i));
87 #else
88                 for_each_online_cpu(j)
89                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
90 #endif
91                 seq_printf(p, " %8s", irq_desc[i].status &
92                                         IRQ_LEVEL ? "level" : "edge");
93                 seq_printf(p, " %8s", irq_desc[i].chip->name);
94                 seq_printf(p, "  %s", action->name);
95
96                 for (action = action->next; action; action = action->next)
97                         seq_printf(p, ", %s", action->name);
98
99                 seq_putc(p, '\n');
100 skip:
101                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
102         }
103         return 0;
104 }